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      docker自定义环境
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        <p>学习docker，自定义运行环境；收集一些信息来做参考；慢慢收集信息。</p>
<ul>
<li><a href="#%E5%A4%B4%E9%83%A8">头部</a></li>
<li><a href="#%E8%BF%90%E8%A1%8C%E7%A8%8B%E5%BA%8F">运行程序</a></li>
<li><a href="#expose">EXPOSE</a></li>
<li><a href="#env">ENV</a></li>
<li><a href="#user">USER</a></li>
<li><a href="#arg">ARG</a></li>
<li><a href="#%E5%8F%82%E8%80%83">参考</a></li>
</ul>
<p>Dockerfile 其实就是构建image的text文本。</p>
<h1 id="头部"><a href="#头部" class="headerlink" title="头部"></a>头部</h1><figure class="highlight dockerfile"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment"># 定制的镜像都是基于 FROM 的镜像</span></span><br><span class="line"><span class="keyword">FROM</span> centos:<span class="number">7.7</span>.<span class="number">1908</span></span><br><span class="line"><span class="keyword">MAINTAINER</span> xxx@xxx.com</span><br><span class="line"><span class="comment"># 定制文件目录</span></span><br><span class="line"><span class="keyword">WORKDIR</span><span class="bash"> /root</span></span><br></pre></td></tr></table></figure>

<h1 id="运行程序"><a href="#运行程序" class="headerlink" title="运行程序"></a>运行程序</h1><figure class="highlight dockerfile"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment"># 依赖包和sshd配置</span></span><br><span class="line"><span class="keyword">RUN</span><span class="bash"> ln -sf /usr/share/zoneinfo/Asia/Shanghai /etc/localtime \</span></span><br><span class="line"><span class="bash">    &amp;&amp; mkdir -p .ssh php /app/data/site /app/<span class="built_in">local</span>/nginx/conf/vhosts \</span></span><br><span class="line"><span class="bash">    &amp;&amp; yum install -y procps-ng iproute net-tools less wget bzip2 \</span></span><br><span class="line"><span class="bash">    openssh-clients openssh-server \</span></span><br><span class="line"><span class="bash">    gcc gcc-c++ autoconf automake libtool make cmake \</span></span><br><span class="line"><span class="bash">    zlib-devel openssl-devel pcre-devel \</span></span><br><span class="line"><span class="bash">    libaio curl-devel libxml2-devel glibc-devel glib2-devel gd-devel gd2-devel libjpeg-devel libpng-devel freetype-devel \</span></span><br><span class="line"><span class="bash">    &amp;&amp; ssh-keygen -t rsa -f /etc/ssh/ssh_host_rsa_key \</span></span><br><span class="line"><span class="bash">    &amp;&amp; ssh-keygen -t dsa -f /etc/ssh/ssh_host_dsa_key</span></span><br><span class="line"></span><br><span class="line"><span class="keyword">RUN</span><span class="bash"> tar zxf openssl-1.1.1c.tar.gz \</span></span><br><span class="line"><span class="bash">    &amp;&amp; tar zxf nginx-1.14.2.tar.gz \</span></span><br><span class="line"><span class="bash">    &amp;&amp; <span class="built_in">cd</span> nginx-1.14.2 \</span></span><br><span class="line"><span class="bash">    &amp;&amp; ./configure --user=www --group=www \</span></span><br><span class="line"><span class="bash">    --prefix=/app/<span class="built_in">local</span>/nginx \</span></span><br><span class="line"><span class="bash">    --with-http_stub_status_module \</span></span><br><span class="line"><span class="bash">    --with-openssl=../openssl-1.1.1c \</span></span><br><span class="line"><span class="bash">    --with-openssl-opt=<span class="string">&#x27;enable-tls1_3 enable-weak-ssl-ciphers&#x27;</span> \</span></span><br><span class="line"><span class="bash">    --with-http_ssl_module \</span></span><br><span class="line"><span class="bash">    --with-http_realip_module \</span></span><br><span class="line"><span class="bash">    --with-http_sub_module \</span></span><br><span class="line"><span class="bash">    --with-pcre \</span></span><br><span class="line"><span class="bash">    --with-http_v2_module \</span></span><br><span class="line"><span class="bash">    &amp;&amp; make -j2 &amp;&amp; make install \</span></span><br><span class="line"><span class="bash">    &amp;&amp; <span class="built_in">cd</span> &amp;&amp; rpm -ivh filebeat-7.5.1-x86_64.rpm \</span></span><br><span class="line"><span class="bash">    &amp;&amp; rm -rf nginx-* openssl-1.1.1c* filebeat* \</span></span><br><span class="line"><span class="bash">    &amp;&amp; useradd www</span></span><br><span class="line"><span class="comment"># 复制权限文件</span></span><br><span class="line"><span class="keyword">COPY</span><span class="bash"> authorized_keys /root/.ssh/authorized_keys</span></span><br></pre></td></tr></table></figure>

<h1 id="EXPOSE"><a href="#EXPOSE" class="headerlink" title="EXPOSE"></a>EXPOSE</h1><p>仅仅只是声明端口</p>
<figure class="highlight dockerfile"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">EXPOSE</span> <span class="number">22</span> <span class="number">80</span></span><br></pre></td></tr></table></figure>

<h1 id="ENV"><a href="#ENV" class="headerlink" title="ENV"></a>ENV</h1><p>设置环境变量，定义了环境变量，那么在后续的指令中，就可以使用这个环境变量。</p>
<figure class="highlight dockerfile"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">ENV</span> &lt;key&gt; &lt;value&gt;</span><br><span class="line"><span class="keyword">ENV</span> &lt;key1&gt;=&lt;value1&gt; &lt;key2&gt;=&lt;value2&gt;...</span><br></pre></td></tr></table></figure>
<h1 id="USER"><a href="#USER" class="headerlink" title="USER"></a>USER</h1><p>用于指定执行后续命令的用户和用户组，这边只是切换后续命令执行的用户（用户和用户组必须提前已经存在）。</p>
<p>格式：</p>
<figure class="highlight dockerfile"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">USER</span> &lt;用户名&gt;[:&lt;用户组&gt;]</span><br></pre></td></tr></table></figure>

<h1 id="ARG"><a href="#ARG" class="headerlink" title="ARG"></a>ARG</h1><p>构建参数，与 ENV 作用一至。不过作用域不一样。ARG 设置的环境变量仅对 Dockerfile 内有效，也就是说只有 docker build 的过程中有效，构建好的镜像内不存在此环境变量。</p>
<p>构建命令 docker build 中可以用 –build-arg &lt;参数名&gt;=&lt;值&gt; 来覆盖。</p>
<p>格式：</p>
<figure class="highlight dockerfile"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">ARG</span> &lt;参数名&gt;[=&lt;默认值&gt;]</span><br></pre></td></tr></table></figure>

<h1 id="参考"><a href="#参考" class="headerlink" title="参考"></a>参考</h1><ul>
<li>[1] <a target="_blank" rel="noopener" href="https://www.runoob.com/docker/docker-dockerfile.html">菜鸟Dockerfile说明</a></li>
<li>[2] <a target="_blank" rel="noopener" href="https://docs.docker.com/engine/reference/builder/">官网参考</a></li>
<li>[3] <a target="_blank" rel="noopener" href="https://www.cnblogs.com/dazhoushuoceshi/p/7066041.html">Dockerfile命令详解（超全版本）</a></li>
</ul>

      
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